Self-locking nut and process of making same.



D. 0. WARD, DBGD.

K. L. WARD, ADHINISTBATEIX.

SELF LOOKING NUT AND rnocsss OF MAKING SAME.

1,087,056 APPLICATION FILED MAE. 3, 1913. Patented Feb. 10,

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UNITED STATES. PATENT OFFICE.-

DANIEL O. WARD, OF OAK PARK, ILLINOIS; NELLIE LEE WARD ADMINIS 'E RATRIX OF SAID DANIEL O. WARD, DECEASED.

SELF-LOCKING NUT AND PROCESS OF MAKING SAME.

Specification of Letters Patent.

Patented Feb. 10,1914.

Application filed March 3, 1913. Serial No. 751,855.

and Processes of Making Same, of which the following is a specification, reference being had therein to the accompanying drawing.

This invention relates to an improvement in self-locking nuts and an improved process for making the same.

One of the objects of the present invention is the provision of a self-locking not of a simple and efficient construction which is stronger and more durable than nuts of a somewhat similar character heretofore suggested in this art.

A further object-of theinvention is the provision of an improved process adapted to render the manufacture of the improved nuts above referred to, economical and commercially feasible.

The invention, both as respects the process and its resultant product, will be more readily understood from the detailed description hereinafter contained when'read in connection with the accompanying drawings forming a part hereof, and wherein,

Figure 1 is a perspective view of a selflocking nut constructed in accordance with the present invention; Fig. 2 is a cross secs tion thereof; Figs. 3 and 4 are perspective views of a bar of metal stock showing the different shapes to which said bar is rolled during the manufacture of the improved self-locking nut; and Fig. 5 is a perspective view of one of the nut blanks as obtained from the bar of metal stock shown in Fig. 3.

Referring now more particularly to the drawings, wherein like reference "lettersv designate corresponding features inthe'sevoral views, it will be seen that the improved self-locking nut comprises a body A which is provided with a centrally disposed threaded opening a extending therethifough for the reception of an 'meinary threaded bolt, said body being provided'in'opposit'e sides thereof with grooves a which extend transverselyacross the body of the nut and inwardly so as to intersect the opening (1 extending centrally therethrough, so that there is provided at each side of the nut, above the main body portion thereofl an d in the usual manner.

the grooves a,s'ections A which extend upwardly at a slight angle to the main body portion of the nut, so that when the'nut is threaded onto a bolt, and the sections A are forced downwardly toward the main bodv portion of the nut, said nut will be locked firmly in position on the bolt, the thread being formed through the body and sections A. after the latter are deflected away from the body, so that the threaded portions within the sections are displaced relative to the thread of the bolt to create a binding engagement therebetween when the sections are forced toward the body, in the application of the nut, as stated.

The particular novelty of the present construction is that the metal of the nut is condensed, as at a adjacent the grooves 41' formed therein, thus materially increasing the strength of the sections A which have to be bent when the nut is used, and consequently greatly lengthening the life of the nut.

In forming the improved self-locking nut, a bar of stock metal is first heated and treated by suitable rolls to cause it to assume the shape shown in Fig. 3, that is, the bar is rolled to a substantially rectangular cross section; then a groove or channel I) is rolled in each edge thereof, adjacent the upper surface of the bar by a single or by successive rolling operations (as at as), said grooves extending inwardly of the central portion of the bar. The bar of metal stock is then subjected to further treatment by suitable rollsa single or successive rolling operation (as at y)to' cause the deflection of the portions of the bar above the grooves b which have been-rolled in the sides thereof. The bar, after this operation, will appear as in Fig. 4. After being rolled to this form, the bar B is placed .in a bulldozer machine, andthe nut blanks are cut therefrom, the bolt receiving opening being formed simultaneously in the nut blank as it iscut from the bar B.

To complete the self-locking nut, the nut blanks are placed in athreading machine and the bolt receiving openings thereof threaded As the bar of metal stock is brought to its proper form entirely by rolling, it will be seen that the process "can be practiced much more readily, with out waste, and more economically than those separated from said main body portion by;

processes in which it is necessary to cut away a portion of the metal, or to saw into the s'ides,-both slow and expensive operations. Furthermore, by the particular process herein described, a superior and more durable article of manufacture is obtained than is the case where the method of manufacture involves the cutting out, or sawing away of the metal, since by rolling the metal .to form the channels in the sides of the nut, the metal adjacent to said channels is condensed, which materially strengthens the nut where it would otherwise be weakest, namely, along the lines of juncture between the locking portions A and the main body portion of the nut.

It is to be observed that by reason of forming the nut from a solid blank, as distinguishedfrom folding over a nut from a sheet of metal, no portions of the body. of metal are weakened during the process, while at the same time the condensed metallic portions as hereinbefore set forth are obtained. -It will also be appreciated that not only are the lines of juncture between the locking portions A and the main body of the nut reinforced by the condensing of the metal thereat, but under the compressing operation the flanges a are, of course, strengthened to the extent that some of the metal will also be compressed and taken up in the flanges as well as the adjoining surface of the body, although, of course, the greatest condensed portion will be at the base of the groove or line of juncture between the flange and body, as stated.

While I have herein disclosed a specific embodiment of the invention, it will be apparent to persons skilled in the art that said invention is capable of embodiment in other forms and devices, as may be in keeping with the hereto appended claims.

I claim 1. A self-locking body portion provided with a threaded bolt receiving aperture, and with a transverse groove extending inwardly from one side thereof, the metal of said nut adjacent said groove being condensed and the metal therebeyond being of at least the normal density of the blank from which the nut is formed.

2. A self-locking nut comprisin a main body portion having a threaded be t receiving'aperture, said main body portion being provided with transverse grooves extending inwardly from opposite sides thereof to form locking portions'spaced from the main body ortion of said nut, the metal of the nut adjacent the connection of said locking portions with the main body portion thereof being condensed.

3. A self-locking nut comprising a main body portion, and a bendable locking portion integral with .said main body portion and spaced therefrom, said nut being pro vided with a bolt receiving aperture exv nut comprising a main tending through the main body portion and said locking portion, and the metal of said nut adjacent the connection of the locking portion with the main body portion thereof being condensed. I

4. The process of making self-locking nuts consisting in compressing the metal of' a metallic bar to form an inwardly extending groove in one side thereof, dividing the bar into individual nut blanks, and forming in each of the nut blanks a threaded bolt receiving opening.

5. The method of forming self-locking nuts, consisting in rolling a metal bar to provide an inwardly extending groove in one side of said bar, further rollin the bar to flare the ortion of said bar a ove the groove, dividing the bar into individual nut blanks, providin each blank with an opening which exten s therethrough, and threading the opening thus formed in each of the blanks.

6. The method of forming self-locking nuts consisting in rolling a bar of metal to provide inwardly extending grooves in the sides thereof, dividing the ar thus formed into individual nut blanks, and forming a threaded bolt receiving opening in each of the nut blanks.

7. The method of forming self-locking nuts consisting'in rolling a bar of metal to provide inwardly extending ooves in the opposite sides thereof, bending upwardly the portions of said bar positioned above said ooves, dividing the bar into individua nut blanks, forming an opening through each of said blanks, and threading the openings in the nut blanks.

8. The method of forming a self-locking nut consisting in compressing the metal of a nut blank to form oppositely disposed inwardly extendin grooves in the sides thereof, ceiving opening in said blank.

9. The process of making self-locking nuts consisting in compressing the metal of.

' blank with an opening which extends therethrough and intersects the groove in the side thereof, and threading the opening thus formed in each of the blanks.

11. The process of making self-locking nuts consisting in the following steps, to

and formlng a threaded bolt re- I wit; compressing metal of the metallic bar to form an inwardl extending groove in one side thereof, divldin the bar into individual nut blanks forming in each of the blanks a threaded bolt receiving opening extending into both of the grooved portions so that the opening intersects the groove, and deflecting the grooved port-ions with respect to each other.

12. The rocess of making locking devices comprlsing the condensing of a portion of a metal blank to space a will from the body thereof and strengthen t e line of juncture therebetween, and aperturing the blank to constitute a bolt opening, substantially as described.

13. The vices comprising the spacing of an integral wing from a metal body, and condensing the metal of a portion of the. body at the point of juncture between the body and wing, substantially as described.

14. A locking device of the character derocess of making locking described comprising a metal body, a wing integral therewith and spaced therefrom, the juncture between the body and wing being constituted by condensed portions of the metal and the metal therebeyond being of, at least the normal densit of the blank from which the nut is forme substantially as described.

15. A locking device of the character described comprising a metal body, a wing integral therewith and spaced therefrom, the juncture between the body and wing being constructed by condensed port-ions of the metal, said wing being also formed by condensed portions of sa d metal, substantially as described.

In testimony whereof I aflix my signature in presence of two witnesses.

DANIEL O.WARD.

Witnesses:

Jos. H. MILANS, FRANCIS THOMAS. 

